RU180307U1 - FITTING JOINT FOR METAL-PLASTIC PIPES - Google Patents

Abstract

The utility model relates to fitting connections used to connect plastic pipes during installation and dismantling. This technical solution describes a fitting connection for metal-plastic pipes, interfaced with a metal-plastic pipe using a connecting pipe - a nipple. The fitting includes a body, on the surface of which there is a thread, a turn-key holder, made indiscriminately as one part with a tapered shank of the nozzle with an angle of inclination to its axis 10-45 °, providing a tight pressing of the fitting to the pipe surface previously flared at an angle of 10-45 ° from the side of its inner diameter. The claimed fitting connection provides quick dismantling and installation of metal-plastic pipes, preserving the integrity of the pipe during dismantling, during repair work, in case of emergency, increased tightness of the connection. 3 ill.

Description

The utility model relates to means for joining metal-plastic pipes, specifically to a fitting joint for metal-plastic pipes, used for quick connection and disconnection of water pipelines, during their initial installation, as well as during repair work.

It is well known that the term fitting means a connecting part used in the joints of any pipes.

The connection can be of a different nature: ordinary pipe joints of the same and different diameters or configurations, all kinds of branches, turns and taps. Also, fittings act as plugs on the end parts of pipes and in places of temporary or permanent overlap.

Fittings are used in those sections of pipelines where a welding joint is impossible, inefficient, and the possibility of periodic access to the joint for repair or dismantling is necessary. In some cases, fittings are also used to reliably shut off pipelines.

Depending on the purpose of use, the fittings are of the following types:

- Corners or bends-elements that serve to change the direction of the pipeline at a certain angle (from 45 ° to 120 °).

- Tees, crosses and collectors-elements used in places of single or double branching of additional pipes from the main pipeline.

- Couplings and barrels-elements for easy connection of pipes of the same diameter and shape. The couplings are internally threaded and require threads at the ends of the pipes to be connected, for barrels, the thread is on the outside.

- Fittings of transitional type (bends, nipples, futorki) - elements for connecting pipes of different diameters, configurations and materials. This type of fittings is used in conjunction with couplings.

- Fittings for fastening rigid pipes with hoses.

- Plugs-elements used for permanent or temporary blocking of flows (liquid or gas) in a certain direction.

The connection of pipes using fittings can be of a different nature. The type of connection depends on the material of the pipe, the required strength and the possibility of obtaining further access to the connected elements.

Threaded fittings - provide a reliable and durable connection of metal pipes. Elements of this type are threaded from the inside or outside, due to which they are connected to the ends of the pipes, also equipped with threads. For additional sealing use a special tow and paste.

Welded fittings (soldered fittings) - the connection is made by welding or soldering the fitting with parts of pipes. Traditional welding of metal pipes with fittings is rarely used today, and mainly for industrial purposes. A more modern method of connection is more like a solder: a special wire is placed inside the fitting, which melts during heating of the connection and turns into solder connecting the elements.

Welded fittings for plastic pipes - connect plastic pipes in a manner similar to welding metal elements. The edges of the fitting and part of the pipe are melted with a special soldering iron until a reliable seam is formed. The same fittings can be used for bonding with a special compound that partially melts the plastic, forming a joint similar to a welded one.

Crimp fittings - connecting elements, implying the presence of a crimp ring, with which the tight fitting of the fitting and pipe to each other is ensured. To increase the sealing use special seals.

Press fittings - these elements connect plastic and metal-plastic pipes by reducing the diameter of the fitting created by a special tool. The connection is reliable, but indistinguishable.

In particular, a press fitting is known from RU 78284 U1, November 20, 2008, comprising a hollow body with at least one tubular shank covered by a crimp sleeve of a plastically deformable metal alloy to secure the end of a metal-plastic or plastic pipe between the shank and the crimp with a sleeve, while on the outer surface of the shank, at its end, there are two conically arranged conical surfaces, the vertices of which are oriented in the direction from the body, and further along the length of the shank, in the direction of the body a, the first crimping groove, the first sealing groove in which the annular sealing element is located, the second crimping groove, the second sealing groove in which the annular sealing element is also located, as well as the closing conical groove adjacent to the housing, the top of the conical surface of which is oriented in the direction from the housing.

This press fitting is designed for continuous connection with metal-plastic or plastic pipes of domestic water supply systems.

Due to the fact that the specified press fitting is non-separable, this does not allow for quick dismantling of it, which makes it ineffective in eliminating emergencies.

Compression fittings, which belong to the group of semi-detachable joints, are also well known. Their main advantage is ease of installation and reliable connections. These elements can be used repeatedly after dismantling, collecting the pipeline of various configurations.

Compression fittings contain the following components:

- fitting;

- crimp ring;

- union nut.

Compression fittings are considered semi-detachable, but in reality they can be mounted several times, but with each subsequent use their reliability is called into question.

Most often, the compression type of connection is used for plastic pipes intended for transporting cold water.

Given that in many regions tap water does not always meet existing standards for its quality, as a result of redox processes, a corrosion of the fitting occurs, which leads to its destruction and the need to quickly dismantle it, in order to avoid an emergency. Quick dismantling of a fitting that has undergone corrosion damage is virtually impossible due to the design of the press fitting and compression fitting.

In compression fittings related to semi-detachable joints, the fitting or shank of the fitting, as a result of corrosion damage, is destroyed and remains in the metal-plastic pipe.

Due to the structural features of the fitting shank, for example, of a cylindrical shape, this complicates the dismantling of such a fitting connection and leads to the unsuitability of the metal-plastic pipe when removing the fitting from it, with the design of such a fitting shank.

In particular, from RU 12718 U1, 01/27/2000, a fitting (fitting connection) is known for quick installation and dismantling of a pipe connection, including a body made in the form of a tube-shaped body having sockets at its ends, and one of the connected pipes is located in each socket , which is made abutted in a vertical housing element, characterized in that the space between the pipe surface and the inner surface of the socket is filled with a sealing gasket, which is pressed by a washer, supported by the end face of the fitting, movably mounted on a single pipe, and having a threaded contact with the inner surface of the socket, is filled with a sealing gasket, which is pressed by a washer, supported by the end of the fitting, movably mounted on the connected pipe, and having a threaded contact with the inner surface of the socket of the body, and the inter-socket part of the body and the fitting shank are made in the form of standard nuts.

Known fitting connection (fitting) is used for quick connection and disconnection of sanitary pipes, especially metal, providing quick installation and dismantling of the pipe connection, eliminating leakage at the point of their connection. However, for the above reasons, due to possible corrosion failure of the fitting shank, removing it from the pipe makes it difficult to quickly dismantle it and renders the pipe itself unusable.

From RU 109820 U1, 05/19/2011, a fitting of a plastic fitting is known, made tubular and provided on the outer surface with at least two annular protrusions having an axially shaped tooth-like shape, while the teeth in the said section are inclined to the axis of the fitting, in the direction from a joining part, characterized in that the outer diameter of the fitting on the protrusions increases, in the direction from the joining part.

The known fitting provides a reliable and tight connection of the fitting with the polymer pipe, however, if it is necessary to quickly dismantle the fitting, in case of emergency due to the fact that the fitting is made tubular, it is also difficult to remove it from the pipe and, in addition, violation of the integrity of the plastic pipe itself.

The technical task of the claimed technical solution, as a utility model, is to eliminate the above disadvantages and create a reliable fitting connection of metal-plastic pipes.

In connection with the stated technical task, the technical result achieved by the claimed technical solution, as a useful model, is to simplify the quick installation and dismantling of the fitting for metal-plastic pipes during repair work, to increase the tightness, the strength of the joint between the fitting and the pipe, while maintaining and the integrity of the metal-plastic pipe, in the event of an emergency, as a result of corrosion damage to the fitting connection or the metal-plastic pipe, also expand the arsenal of means used for connecting plastic pipes, with the repair work.

The stated technical task and the technical result achieved are ensured by the following design of the fitting connection for metal-plastic pipes, mating with the metal-plastic pipe by a connecting pipe-nipple, including a body, on the surface of which there is a thread and a turn-key holder made indiscriminately as one piece, with a tapered shank of the fitting, with an angle of inclination of the generatrix of the conical part of the shank to its axis, which varies between 10-45 °, providing tight pressing of the fitting Connections to the previously flared at an angle of 10-45 °, the pipe surface to the inner its diameter.

According to the claimed technical solution, as a utility model, the fitting connection for metal-plastic pipes, as well as the connecting pipe-nipple for interfacing it with a metal-plastic pipe, are made of the same materials, for example, copper, brass, cast iron, metal-plastic, polypropylene, polyethylene terephthalate (PET) and other related materials.

The claimed fitting connection (fitting), as a utility model, is illustrated in the FIGS. 1 and FIG. 2, FIG. 2 '.

The fitting connection includes a housing (1) having a thread on the outer surface, a turn-key holder (3) of the fitting, made indivisibly as one part, with a tapered shank (2) of the fitting, and mating with a metal-plastic pipe (4), a connecting pipe (5 ) - nipple.

The tapered shank (2) of the nozzle has an inclination angle to its axis of 10-45 °. The described unique design of the fitting connection (fitting), which is mated by a connecting pipe-nipple with a metal-plastic pipe, previously expanded at an angle of 10-45 °, provides a tight pressing of the fitting to the surface of the metal-plastic pipe, from the side of its inner diameter.

When mounting a fitting (connecting it to a metal-plastic pipe), use a union nut (6) (with internal thread), traditionally used to connect various types of fitting.

The sizes of fittings, nipple tubes, as well as the diameters of the metal-plastic pipes themselves, can have different values.

The following examples illustrate the claimed technical solution, but do not limit the scope of its claims stated in the utility model formula.

Example 1

To connect the fitting with a melalloplastic pipe (for sanitary purposes), mating with it, using a connecting pipe-nipple, a fitting with a tapered shank of the fitting, with an angle of inclination to its axis of 10 °, 25 °, 45 °, made of brass ( fitting and nipple).

Installation of a fitting having a turn-key holder (3) and a thread on the outer surface of the fitting body (1), made with a tapered shank (2) of the fitting, cannot be dismantled as one piece, and connected with a plastic pipe by a connecting pipe (5) - a nipple, is carried out as follows way:

a) Carry out the preparation (flaring) of the metal-plastic pipe (preparation of its edge for fitting);

b) Dock the fitting using its holder (3) with a metal-plastic pipe mated previously with the pipe-nipple (5). The pipe is connected to the fitting through the tapered shank (2) of the fitting. The metal-plastic pipe is pre-flared, respectively, at an angle of 10 °, 25 °, 45 ° (the angle between the generatrix of the cone and the axis of symmetry in the longitudinal section). When joining the fitting and the metal-plastic pipe, due to the special design of the conical shank (2) of the nozzle and the connecting pipe-nipple (5), the fitting is pressed tightly onto the previously flared pipe surface, from the side of its inner diameter and the tightness of the connection due to the creation of a working tightness in it after tightening the union nut on the thread of the fitting from the side of the conical shank and the occurrence of axial pressing force on the tube-nipple by means of a special flange of the nut.

Example 2

Installation of the fitting connection in the metal-plastic pipe is carried out analogously to example 1, but at the same time, the fitting connection, together with the mating tube-nipple (connecting tube), is made of a polymer material, for example, polyethylene terephthalate.

The claimed fitting connection (fitting), due to the peculiarities of its structural design, in particular, its housing, as one part with a tapered shank of the nozzle, provides a tight connection between the fitting and the pipe, its tightness, and also allows for quick installation of the fitting and its quick dismantling with corrosion damage.

In case of failure, for example, of a fitting, it is quickly removed from the pipe, without violating the integrity of the pipe itself. The same quick dismantling of the fitting is carried out, and in case of violation of the tightness of the connection and violation of the integrity of the plastic pipe.

Moreover, in FIG. 1 shows the design of a fitting mating with a metal-plastic pipe (nipple) and made indiscriminately as one part; in FIG. 2 and FIG. 2 'shows a fitting in an assembly installed in a metal-plastic pipe.

Claims (1)

A fitting connection for metal-plastic pipes, interfaced with a pipe-nipple with a pipe, including a body, on the surface of which there is a thread, a turn-key holder, made indiscriminately as one part with a tapered shank of the fitting with an angle of inclination of the conical part of the shank to its axis, which varies within 10 -45 °, providing a tight pressing of the fitting to the pipe surface previously flared at an angle of 10-45 ° from the side of its inner diameter.

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